# Symplectic manifold

In mathematics, a symplectic manifold is a smooth manifold, M, equipped with a closed nondegenerate differential 2-form, ω, called the symplectic form. The study of symplectic manifolds is called symplectic geometry or symplectic topology. Symplectic manifolds arise naturally in abstract formulations of classical mechanics and analytical mechanics as the cotangent bundles of manifolds. For example, in the Hamiltonian formulation of classical mechanics, which provides one of the major motivations for the field, the set of all possible configurations of a system is modeled as a manifold, and this manifold's cotangent bundle describes the phase space of the system.

Any real-valued differentiable function, H, on a symplectic manifold can serve as an energy function or Hamiltonian. Associated to any Hamiltonian is a Hamiltonian vector field; the integral curves of the Hamiltonian vector field are solutions to Hamilton's equations. The Hamiltonian vector field defines a flow on the symplectic manifold, called a Hamiltonian flow or symplectomorphism. By Liouville's theorem, Hamiltonian flows preserve the volume form on the phase space.

## Motivation

Symplectic manifolds arise from classical mechanics, in particular, they are a generalization of the phase space of a closed system.[1] In the same way the Hamilton equations allow one to derive the time evolution of a system from a set of differential equations, the symplectic form should allow one to obtain a vector field describing the flow of the system from the differential dH of a Hamiltonian function H. As Newton's laws of motion are linear differential equations, such a map should be linear as well.[2] So we require a linear map TM → T* M, or equivalently, an element of T* MT* M. Letting ω denote a section of T* MT* M, the requirement that ω be non-degenerate ensures that for every differential dH there is a unique corresponding vector field VH such that dH = ω(VH,· ). Since one desires the Hamiltonian to be constant along flow lines, one should have dH(VH) = ω(VH, VH) = 0, which implies that ω is alternating and hence a 2-form. Finally, one makes the requirement that ω should not change under flow lines, i.e. that the Lie derivative of ω along VH vanishes. Applying Cartan's formula, this amounts to

$\mathcal{L}_{V_H}(\omega) = d\omega(V_H) = 0$

which is equivalent to the requirement that ω should be closed.

## Definition

A symplectic form on a manifold M is a closed non-degenerate differential 2-form ω.[3][4] Here, non-degenerate means that for all pM, if there exists an XTpM such that ω(X,Y) = 0 for all YTpM, then X = 0. The skew-symmetric condition (inherent in the definition of differential 2-form) means that for all pM we have ω(X,Y) = −ω(Y,X) for all X,YTpM. In odd dimensions, antisymmetric matrices are not invertible. Since ω is a differential two-form, the skew-symmetric condition implies that M has even dimension.[3][4] The closed condition means that the exterior derivative of ω vanishes, dω = 0. A symplectic manifold consists of a pair (M,ω), of a manifold M and a symplectic form ω. Assigning a symplectic form ω to a manifold M is referred to as giving M a symplectic structure.

## Linear symplectic manifold

There is a standard linear model, namely a symplectic vector space R2n. Let R2n have the basis {v1, ..., v2n}. Then we define our symplectic form ω so that for all 1 ≤ in we have ω(vi,vn+i) = 1, ω(vn+i,vi) = −1, and ω is zero for all other pairs of basis vectors. In this case the symplectic form reduces to a simple quadratic form. If In denotes the n × n identity matrix then the matrix, Ω, of this quadratic form is given by the (2n × 2n) block matrix:

$\Omega = \left(\begin{array}{c|c} 0 & I_n \\ \hline -I_n & 0 \end{array}\right).$

## Lagrangian and other submanifolds

There are several natural geometric notions of submanifold of a symplectic manifold.

• symplectic submanifolds (potentially of any even dimension) are submanifolds where the symplectic form is required to induce a symplectic form on them.
• isotropic submanifolds are submanifolds where the symplectic form restricts to zero, i.e. each tangent space is an isotropic subspace of the ambient manifold's tangent space. Similarly, if each tangent subspace to a submanifold is co-isotropic (the dual of an isotropic subspace), the submanifold is called co-isotropic.

The most important case of the isotropic submanifolds is that of Lagrangian submanifolds. A Lagrangian submanifold is, by definition, an isotropic submanifold of maximal dimension, namely half the dimension of the ambient symplectic manifold. One major example is that the graph of a symplectomorphism in the product symplectic manifold (M × M, ω × −ω) is Lagrangian. Their intersections display rigidity properties not possessed by smooth manifolds; the Arnold conjecture gives the sum of the submanifold's Betti numbers as a lower bound for the number of self intersections of a smooth Lagrangian submanifold, rather than the Euler characteristic in the smooth case.

## Lagrangian fibration

A Lagrangian fibration of a symplectic manifold M is a fibration where all of the fibres are Lagrangian submanifolds. Since M is even-dimensional we can take local coordinates (p1,…,pn,q1,…,qn), and by Darboux's theorem the symplectic form ω can be, at least locally, written as ω = ∑ dpk ∧ dqk, where d denotes the exterior derivative and ∧ denotes the exterior product. Using this set-up we can locally think of M as being the cotangent bundle T*Rn, and the Lagrangian fibration as the trivial fibration π : T*RnRn. This is the canonical picture.

## Lagrangian mapping

Let L be a Lagrangian submanifold of a symplectic manifold (K,ω) given by an immersion i : LK (i is called a Lagrangian immersion). Let π : KB give a Lagrangian fibration of K. The composite (πi) : LKB is a Lagrangian mapping. The critical value set of πi is called a caustic.

Two Lagrangian maps (π1i1) : L1K1B1 and (π2i2) : L2K2B2 are called Lagrangian equivalent if there exist diffeomorphisms σ, τ and ν such that both sides of the diagram given on the right commute, and τ preserves the symplectic form.[4] Symbolically:

$\tau \circ i_1 = i_2 \circ \sigma, \ \nu \circ \pi_1 = \pi_2 \circ \tau, \ \tau^*\omega_2 = \omega_1 \, ,$

where τ*ω2 denotes the pull back of ω2 by τ.

## Special cases and generalizations

• Symplectic manifolds are special cases of a Poisson manifold. The definition of a symplectic manifold requires that the symplectic form be non-degenerate everywhere, but if this condition is violated, the manifold may still be a Poisson manifold.
• A multisymplectic manifold of degree k is a manifold equipped with a closed nondegenerate k-form.[5]
• A polysymplectic manifold is a Legendre bundle provided with a polysymplectic tangent-valued $(n+2)$-form; it is utilized in Hamiltonian field theory.[6]

## Notes

1. ^ Ben Webster: What is a symplectic manifold, really? http://sbseminar.wordpress.com/2012/01/09/what-is-a-symplectic-manifold-really/
2. ^ Henry Cohn: Why symplectic geometry is the natural setting for classical mechanics http://research.microsoft.com/en-us/um/people/cohn/thoughts/symplectic.html
3. ^ a b Maurice de Gosson: Symplectic Geometry and Quantum Mechanics (2006) Birkhäuser Verlag, Basel ISBN 3-7643-7574-4. (page 10)
4. ^ a b c Arnold, V. I.; Varchenko, A. N.; Gusein-Zade, S. M. (1985). The Classification of Critical Points, Caustics and Wave Fronts: Singularities of Differentiable Maps, Vol 1. Birkhäuser. ISBN 0-8176-3187-9.
5. ^ F. Cantrijn, L. A. Ibort and M. de León, J. Austral. Math. Soc. Ser. A 66 (1999), no. 3, 303-330.
6. ^ G. Giachetta, L. Mangiarotti and G. Sardanashvily, Covariant Hamiltonian equations for field theory, Journal of Physics A32 (1999) 6629-6642; arXiv: hep-th/9904062.